Display substrate and method for manufacturing same, and display device

Abstract

Provided is a display substrate. The display substrate includes: a substrate body; and a plurality of support pillars disposed on the substrate body, wherein the support pillar includes a first surface in contact with the substrate body, and a second surface opposite to the first surface; wherein in any direction parallel to the substrate body, a ratio of a width of the first surface to a width of the second surface is greater than or equal to 0.8, and is less than or equal to 1.2.

1 . A display substrate, comprising:
 a substrate body; and   a plurality of support pillars disposed on the substrate body, wherein the support pillar comprises a first surface in contact with the substrate body, and a second surface opposite to the first surface;   wherein in any direction parallel to the substrate body, a ratio of a width of the first surface to a width of the second surface is greater than or equal to 0.8, and is less than or equal to 1.2.   
     
     
         2 . The display substrate according to  claim 1 , wherein in the any direction parallel to the substrate body, a ratio of an absolute value of a difference value between the width of the first surface and the width of the second surface to the width of the first surface is less than or equal to 0.4. 
     
     
         3 . The display substrate according to  claim 1 , wherein the support pillar comprises: a first portion and a second portion that are laminated in a direction perpendicular to and away from the substrate body, wherein an orthogonal projection of the second portion on the substrate body is within an orthogonal projection of the first portion on the substrate body, a side face of the first portion is a flat surface, and a side face of the second portion is a curved concave surface. 
     
     
         4 . The display substrate according to  claim 3 , wherein the absolute value of the difference value between the width of the first surface and the width of the second surface is less than or equal to 0.8 μm. 
     
     
         5 . The display substrate according to  claim 3 , wherein an included angle between the side face of the first portion and a face, proximal to the substrate body, of the first portion ranges from 85° to 90°. 
     
     
         6 . The display substrate according to  claim 3 , wherein in a direction perpendicular to the side face of the first portion, a maximum depth of the curved concave surface ranges from 0.1 μm to 0.2 μm. 
     
     
         7 . The display substrate according to  claim 3 , wherein in the direction perpendicular to the substrate body, a ratio of a thickness of the second portion to a thickness of the first portion ranges from 1/7 to 1/6. 
     
     
         8 . The display substrate according to  claim 1 , further comprising: a protection structure disposed on a side, facing away from the substrate body, of the support pillar, wherein an orthogonal projection of the support pillar on the substrate body is within an orthogonal projection of the protection structure on the substrate body, and a material of the protection structure is different from a material of the support pillar. 
     
     
         9 .- 11 . (canceled) 
     
     
         12 . The display substrate according to  claim 7 , wherein in the direction perpendicular to the substrate body, a thickness of the support pillar ranges from 0.8 μm to 1.5 μm. 
     
     
         13 . The display substrate according to  claim 1 , wherein the display substrate is an array substrate, and the substrate body comprises: a first base, and a thin-film transistor, a flattening layer, a pixel electrode, and an auxiliary support pillar that are disposed on the first base; wherein
 the thin-film transistor is provided with a source and a drain;   the flattening layer is disposed on a side, facing away from the first base, of the thin-film transistor, and is provided with a connection via hole, and at least a portion of the source or the drain is disposed in the connection via hole;   the pixel electrode is disposed on a side, facing away from the first base, of the flattening layer, and a portion of the pixel electrode is disposed in the connection via hole and is in contact with the source or the drain; and   the support pillar is disposed outside the connection via hole, the support pillar and the auxiliary support pillar are integrally formed, and the auxiliary support pillar is disposed in the connection via hole.   
     
     
         14 . The display substrate according to  claim 12 , wherein in a direction perpendicular to the first base, a height H of the support pillar and a width W of a face, facing away from the first base, of the support pillar meets: ⅕W≤H≤½W. 
     
     
         15 . The display substrate according to  claim 13 , wherein
 the thin-film transistor is further provided with an active layer in contact with the source and the drain; and   the substrate body further comprises: a light blocking structure disposed on a side, proximal to the first base, of the thin-film transistor, and a buffer layer disposed between the light blocking structure and the thin-film transistor;   wherein an orthogonal projection of the active layer on the first base is within an orthogonal projection of the light blocking structure on the first base, and an orthogonal projection of the support pillar on the first base is within the orthogonal projection of the light blocking structure on the first base.   
     
     
         16 . The display substrate according to  claim 13 , wherein the substrate body further comprises: a passivation layer disposed on a side, facing away from the first base, of the pixel electrode, and a common electrode disposed on a side, facing away from the first base, of the passivation layer; wherein
 a portion of the passivation layer is disposed in the connection via hole, and in the connection via hole, the support pillar is disposed on a side, facing away from the first base, of the passivation layer; and   an orthogonal projection of the common electrode on the first base is not overlapped with an orthogonal projection of the connection via hole on the first base.   
     
     
         17 . (canceled) 
     
     
         18 . The display substrate according to  claim 13 , wherein the width of the face, facing away from the first base, of the support pillar is less than or equal to 4.5 μm. 
     
     
         19 . The display substrate according to  claim 1 , wherein the display substrate is a color film substrate, and the substrate body comprises: a second base, and a color resistance layer and a black matrix that are disposed on the second base;
 wherein the support pillar is disposed on a side, facing away from the second base, of the black matrix, and an orthogonal projection of the support pillar on the second base is within an orthogonal projection of the black matrix on the second base.   
     
     
         20 . The display substrate according to  claim 19 , wherein a width of a face, facing away from the second base, of the support pillar is less than or equal to 2 μm. 
     
     
         21 . A method for manufacturing a display substrate, comprising: forming a plurality of support pillars on a substrate body, wherein the support pillar comprises a first surface in contact with the substrate body, and a second surface opposite to the first surface;
 wherein in any direction parallel to the substrate body, a ratio of a width of the first surface to a width of the second surface is greater than or equal to 0.8, and is less than or equal to 1.2.   
     
     
         22 . The method according to  claim 21 , wherein forming the plurality of support pillars on the substrate body comprises:
 sequentially forming a support film layer and a protection film layer for covering the substrate body on the substrate body, wherein an etching rate on a material forming the protection film layer is less than an etching rate on a material forming the support film layer; and   acquiring the support pillar from the support film layer and a protection structure from the protection film layer by simultaneously patterning the support film layer and the protection film layer;   wherein an orthogonal projection of the support pillar on the substrate body is within an orthogonal projection of the protection structure on the substrate body.   
     
     
         23 . The method according to  claim 22 , further comprising:
 removing the protection structure upon simultaneously patterning the support film layer and the protection film layer.   
     
     
         24 . A display device, comprising: a power supply assembly, and a display substrate; wherein
 the display substrate includes:
 a substrate body; and 
 a plurality of support pillars disposed on the substrate body, wherein the support pillar comprises a first surface in contact with the substrate body, and a second surface opposite to the first surface; 
 wherein in any direction parallel to the substrate body, a ratio of a width of the first surface to a width of the second surface is greater than or equal to 0.8, and is less than or equal to 1.2; and 
   the power supply assembly is configured to supply power to the display substrate.